Nuveen Energy MLP Total Return Fund (the Fund) is a closed-end company. The Fund seeks to achieve its objective by investing primarily in a portfolio of master limited partnerships (MLPs) in the energy sector. Its investment objective is to provide tax-advantaged total return. The Fund will invest at least 80% of its managed assets in MLPs in the energy sector. The Funds consider investments in MLPs to include investments that offer economic exposure to publicly traded and private MLPs in the form of equity securities of MLPs, securities of entities holding primarily general partner or managing member interests in MLPs, securities that are derivatives of interests in MLPs and debt securities of MLPs. The Fund's advisor is Nuveen Fund Advisors, Inc.